1011200209 has 2 divisors, whose sum is σ = 1011200210. Its totient is φ = 1011200208.

The previous prime is 1011200207. The next prime is 1011200213. The reversal of 1011200209 is 9020021101.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 698016400 + 313183809 = 26420^2 + 17697^2 .

It is a cyclic number.

It is not a de Polignac number, because 1011200209 - 2¹ = 1011200207 is a prime.

Together with 1011200207, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 1011200192 and 1011200201.

It is not a weakly prime, because it can be changed into another prime (1011200207) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 505600104 + 505600105.

It is an arithmetic number, because the mean of its divisors is an integer number (505600105).

Almost surely, 2^1011200209 is an apocalyptic number.

It is an amenable number.

1011200209 is a deficient number, since it is larger than the sum of its proper divisors (1).

1011200209 is an equidigital number, since it uses as much as digits as its factorization.

1011200209 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 36, while the sum is 16.

The square root of 1011200209 is about 31799.3743491912. The cubic root of 1011200209 is about 1003.7195507885.

The spelling of 1011200209 in words is "one billion, eleven million, two hundred thousand, two hundred nine".